Remediation structure for ballast track subgrade frost boiling and mud pumping and construction method of remediation structure for ballast track subgrade frost boiling and mud pumping

Abstract

The invention belongs to the technical field of road engineering, and particularly relates to an improvement construction method and structure for ballast track roadbed frost boiling and mud pumping. The renovation construction method for ballast track subgrade frost boiling and mud pumping comprises the following steps that S1, a structure above a subgrade bed is dismantled, and the subgrade bed is excavated downwards; s2, carrying out original soil in-situ improvement on the surface layer of the subgrade bed, so that the original surface layer of the subgrade bed becomes a solidified layer with a certain thickness, and the water stability and rigidity of the surface layer of the subgrade bed are improved; s3, a water-resisting layer is laid on the curing layer; and S4, the structure is restored.

Description

Technical Field

[0001] The invention belongs to the technical field of road engineering, and in particular relates to a construction method for treating mud bubbling on a ballasted track subgrade and a structure for treating mud bubbling on a ballasted track subgrade. Background Art

[0002] The roadbed is composed of natural soil and stone materials, which have the characteristics of diversity, dispersion and stratification. At the same time, it is directly affected by factors such as train dynamic loads and the environment, and is prone to damage after long-term operation.

[0003] Among them, mud and slurry on ballasted track subgrade is one of the more common diseases. The subgrade soil with mud and slurry disease often contains easily softened substances and high content of silty soil, and has the characteristics of strong hydrophilicity and poor water permeability. In sections with poor drainage, natural precipitation or groundwater intrusion softens the poor subgrade and forms mud. Under the action of the dynamic load of the train, the mud is squeezed and sucked upward through the gaps in the ballast bed, and the ballast bed sinks into the softened subgrade, forming mud and slurry disease, reducing the elasticity of the ballast bed, destroying the smoothness and stability of the track, and affecting the safety and comfort of train operation.

[0004] The traditional remediation method for the mud and mud problem of ballasted track subgrade is to excavate and lay a geo-sealing layer or a non-woven geofiber filtration layer (geotextile, geomembrane), etc.

[0005] However, if geotextiles are used alone to treat mud and slurry on the roadbed, they will soon become ineffective. Geotextiles are flexible materials and are easily entrained and rolled up over a long period of time, thus losing their structural integrity. They are also prone to damage during use, so they can only prevent mud and slurry on the roadbed for a short period of time.

[0006] The present invention improves the base bed while laying the waterproof layer, thereby increasing the strength and rigidity of the base bed, and can prevent the waterproof layer from being entrained and rolled up and losing the integrity of the structure, thereby extending the effective period of the waterproof layer, and further extending the effective period of the roadbed mud and slurry treatment.

[0007] At present, the roadbed fill replacement method is usually used to improve the rigidity and strength of the roadbed. When replacing the roadbed fill, it is necessary to first dig the roadbed down to a certain depth, and then fill the Sanqi ash soil back into the pit. This method has many defects: First, there are many construction steps, and it is necessary to dig a pit first, then backfill, and finally compact. If the construction time is limited, the construction can only be completed within a limited time by reducing the replacement depth, resulting in the failure to achieve the expected remediation effect; second, the Sanqi ash soil material is difficult to compact using small manual machinery in a limited space; third, the Sanqi ash soil material is a rigid material, which is prone to deterioration under the action of cyclic loads and dry-wet cycles or freeze-thaw cycles, resulting in the failure to achieve the expected remediation effect.

[0008] In addition, some new reinforcement and remediation methods have emerged in recent years. The main method is to use polyurethane and polyurea to make a protective structure layer. This method has limited improvement on the stiffness of the roadbed filler, and its durability needs to be studied. It also involves a large amount of material loading, complex process, and long construction time. Another method is to use emulsified asphalt to make a protective structure layer and use high-strength waterproof membrane to waterproof and seal the roadbed. This method also involves a large amount of material loading, long construction time, complex process, and long construction time. A thicker overall structure is required to achieve the required remediation effect, which easily leads to the roadbed thickness not meeting the requirements.

[0009] Therefore, it is urgent to develop a relatively simple and efficient process method to effectively control the mud and slurry on the ballasted track subgrade, so as to achieve the smooth and safe operation of the railway line. Summary of the invention

[0010] In view of the technical problems mentioned above, the present invention aims to propose a construction method and structure for treating mud bubbling on ballasted track subgrade, which can effectively treat mud bubbling on ballasted track subgrade.

[0011] According to a first aspect of the present invention, a construction method for treating mud bubbling on a ballasted track subgrade is provided, comprising the following steps:

[0012] S1, dismantle the structures above the foundation bed and dig down to the foundation bed;

[0013] S2, improving the surface layer of the subgrade bed so that the original surface layer of the subgrade bed becomes a solidified layer with a certain thickness, thereby improving the water stability and rigidity of the surface layer of the subgrade bed;

[0014] S3, laying a waterproof layer on the solidified layer;

[0015] S4, restoring the structure.

[0016] In a specific embodiment, in S2, the method for improving the surface layer of the base bed comprises the following steps:

[0017] S21, laying an improver on the base bed, and crushing and stirring the surface layer of the base bed in situ to mix the improver with the surface layer of the base bed;

[0018] S22, compacting the surface layer of the base bed mixed with the improver to form a solidified layer with a certain thickness.

[0019] In a specific embodiment, the improver is used to adjust the water content of the base bed so that the surface layer of the base bed after crushing and stirring is easy to compact.

[0020] In a specific embodiment, when the moisture content of the base bed is higher than a standard value, the improver includes cement and quicklime.

[0021] In a specific embodiment, when the moisture content of the base bed is lower than a standard value, the improver includes cement and a bio-enzyme curing material.

[0022] In a specific embodiment, in S3, a bottom medium-coarse sand layer, a geomembrane and a surface medium-coarse sand layer are laid in sequence from the top surface of the solidified layer upward to form a waterproof layer.

[0023] According to a second aspect of the present invention, there is provided a ballasted track subgrade mud treatment structure constructed using the ballasted track subgrade mud treatment construction method provided by the present invention, comprising a solidification layer and a waterproof layer sequentially arranged upwards.

[0024] In a specific embodiment, the solidified layer is formed by improving the surface layer of the base bed.

[0025] In a specific embodiment, the waterproof layer includes a geomembrane, and the geomembrane is a HDPE geomembrane.

[0026] In a specific embodiment, the waterproof layer includes a surface medium-coarse sand layer and a bottom medium-coarse sand layer respectively arranged on the upper and lower sides of the geomembrane.

[0027] Compared with the prior art, the advantages of the present application are as follows.

[0028] The present invention sets a solidifying layer while laying the waterproof layer, improves the base bed, and improves the strength and rigidity of the base bed. On the one hand, it can prevent the waterproof layer from being entrained and rolled up and losing the integrity of the structure, thereby extending the validity period of the waterproof layer. On the other hand, it can reduce the dynamic deformation of the roadbed caused by the train load, thereby extending the validity period of the roadbed mud and slurry treatment.

[0029] The present invention improves the surface of the base bed in an original soil in-situ manner. It only needs to lay the improver on the surface of the base bed and then crush and stir the surface of the base bed. Compared with the prior art, it saves the construction steps of digging the base bed and backfilling, avoids high-intensity loading and unloading operations, greatly reduces the labor intensity of the staff, and reduces the construction cost, and can complete the remediation work within a shorter construction period.

[0030] The present invention adopts cement composite bio-enzyme or quicklime as a modifier, which can effectively improve the overall rigidity and strength of the roadbed. When cement and bio-enzyme are used as a composite modifier, the modified layer can become a semi-rigid layer with self-repairing ability.

[0031] The geomembrane of the present invention adopts HDPE geomembrane, which overcomes the shortcomings of conventional geomembranes such as low strength, easy deformation, poor puncture resistance, etc., and greatly improves the water-proof performance of the waterproof layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be described below with reference to the accompanying drawings.

[0033] Figure 1 A schematic diagram showing an embodiment of a structure for treating mud and slurry on a ballasted track subgrade provided by the present invention is shown;

[0034] Figure 2 Shows Figure 2 A schematic diagram of the enlarged structure of part A;

[0035] Figure 3 The schematic diagram of the structure of a conventional ballasted track subgrade in the prior art is shown;

[0036] Figure 4 The chart shows the data of actual vehicle verification using three types of trucks: C70, C80 and C96.

[0037] In the figure:

[0038] 1. Ballast bed; 2. Waterproof layer; 21. Geomembrane; 22. Medium-coarse sand layer in the surface layer; 23. Medium-coarse sand layer in the bottom layer; 3. Solidification layer; 4. Subgrade; 5. Sleepers; 10. Structures; 100. Structures for the treatment of mud and slurry on ballasted track subgrade.

[0039] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0040] The present invention will be described below with reference to the accompanying drawings.

[0041] Figure 1 The structure of the ballasted track subgrade mud treatment structure 100 according to the present invention is shown. Figure 1 As shown, the remediation structure 100 for mud and slurry on the ballasted track subgrade includes a solidified layer 3 and a waterproof layer 2 which are arranged in sequence from the top of the base bed 4 upward. The lower end surface of the solidified layer 3 is in contact with the upper end surface of the base bed 4, and the lower end surface of the waterproof layer 2 is in contact with the upper end surface of the solidified layer 3. The waterproof layer 2 can prevent natural precipitation from invading the solidified layer 3 downward, thereby avoiding the softening of the solidified layer 3. The solidified layer 3 has high strength and rigidity, which can ensure the smoothness and stability of the track. Even if the base bed 4 below the solidified layer 3 is softened due to the intrusion of groundwater and other reasons, the mud formed cannot pass upward through the solidified layer 3 and the waterproof layer 2, thereby avoiding the phenomenon of mud and slurry.

[0042] According to the present invention, the solidified layer 3 is formed by improving the surface layer of the base bed 4. That is, the surface layer of the original base bed 4 that needs to be rectified is improved to become the solidified layer 3. In this way, compared with the prior art, the construction steps of digging the base bed and backfilling are saved, and high-intensity loading and unloading operations are avoided, which greatly reduces the labor intensity of the staff and reduces the construction cost, and the remediation work can be completed in a shorter construction period.

[0043] It is easy to understand that the surface layer of the base bed 4 refers to a portion of the thickness of the stratum downward from the upper end surface of the base bed 4, and the thickness of the surface layer of the base bed 4 to be crushed and mixed depends on the thickness of the solidified layer 3 to be set.

[0044] In a preferred embodiment, in order to achieve good solidification and control of mud bubbling, the thickness of the solidified layer 3 is set to be no less than 20 cm, and the seven-day unconfined compressive strength of the solidified layer 3 is ≥3 MPa.

[0045] In a specific embodiment, the waterproof layer 2 includes a geomembrane 21. Preferably, the geomembrane 21 is a HDPE geomembrane. Compared with the existing geomembranes, the HDPE geomembrane has the advantages of high overall strength, not easy to deform, and strong puncture resistance, and can play a better waterproofing performance, thereby helping to achieve a good treatment effect on mud bubbling.

[0046] In order to achieve a good water-proof effect, preferably, the thickness of the HDPE geomembrane 21 is set to be no less than 2 mm.

[0047] In order to make the HDPE geomembrane 21 achieve higher strength and good anti-deformation and anti-puncture effects, preferably, the parameters of the HDPE geomembrane 21 are as follows: yield tensile strength ≥29kN / m, yield elongation ≥12%, ultimate tensile strength ≥53kN / m, ultimate elongation ≥700%, carbon black content between 2 and 3%, standard oxidation induction time ≥100min, and puncture resistance ≥640N.

[0048] In a specific embodiment, the waterproof layer 2 includes a surface medium-coarse sand layer 22 and a bottom medium-coarse sand layer 23 respectively arranged on the upper and lower sides of the geomembrane 21. That is, the bottom medium-coarse sand layer 23 is laid between the geomembrane 21 and the solidification layer 3, and the surface medium-coarse sand layer 22 is laid between the geomembrane 21 and the roadbed 1. By providing the surface medium-coarse sand layer 22 and the bottom medium-coarse sand layer 23, the damage of the geomembrane 21 can be effectively avoided.

[0049] It is easy to understand that medium-coarse sand is a term in this field, generally referring to sand with a particle size of less than 2 mm. The surface medium-coarse sand layer 22 and the bottom medium-coarse sand layer 23 are layers paved with sand with a particle size of less than 2 mm.

[0050] In actual working process, technicians in this field can adjust the thickness of the coarse sand layer 22 in the surface layer and the coarse sand layer 23 in the bottom layer according to actual working conditions. Preferably, in order to achieve a good water-proof effect, the thickness of the coarse sand layer 22 in the surface layer and the coarse sand layer 23 in the bottom layer is set to be not less than 5 cm.

[0051] In this embodiment, if Figure 1 and Figure 2 As shown, the waterproof layer 2 includes a surface medium coarse sand layer 22 with a thickness of not less than 10 cm, a HDPE geomembrane 21 and a surface medium coarse sand layer 23 with a thickness of not less than 10 cm, which are arranged in sequence from top to bottom.

[0052] According to the ballasted track subgrade mud treatment structure 100 of the present invention, the ballasted track subgrade mud treatment is effectively achieved through the combined design of the waterproof layer 2 and the solidification layer 3. In addition, the original soil in situ method is used to improve the surface layer of the original subgrade 4 to form the solidification layer 3, avoiding a large number of unloading and loading operations, greatly reducing the labor intensity and construction costs of the staff, and saving construction time.

[0053] According to the present invention, a construction method for treating mud bubbling on a ballasted track subgrade is provided. In this embodiment, mud bubbling and mud bubbling are treated on a conventional ballasted track in the prior art. Figure 3 The conventional ballasted track subgrade improvement and construction shown is Figure 1 The structure 100 for remediating mud and oozing of ballasted track subgrade is shown.

[0054] The construction method for treating mud and slurry on ballasted track subgrade specifically comprises the following steps S1 to S4.

[0055] S1, dismantle the structure 10 above the base bed 4 and dig down to the base bed 4.

[0056] S2, improving the surface layer of the base bed 4 so that the original surface layer of the base bed 4 becomes a solidified layer 3 with a certain thickness, thereby improving the water stability and rigidity of the surface layer of the base bed of the roadbed (the improvement structure 100 for muddy and bubbling ballasted track roadbed).

[0057] S3, laying the waterproof layer 2 on the solidified layer 3.

[0058] S4, restore structure 10.

[0059] According to the present invention, in a specific embodiment, in step S1, Figure 3 As shown, the structure 10 refers to the roadbed 1 and the sleepers 5 built on the base bed 4. It should be noted that in actual working conditions, there may be other constructed objects on the base bed 4, which are all within the scope of the structure 10 described in this embodiment and are not listed here one by one.

[0060] In a specific embodiment, in step S1 , after the sleepers 5 and the ballast bed 1 are removed or excavated, the top surface of the base bed 4 is exposed.

[0061] In a specific embodiment, in step S2, Figure 3 The surface layer of the base bed 4 in the Figure 1 The solidified layer 3 in.

[0062] The method for improving the surface layer of the base bed 4 to form the solidified layer 3 includes the following steps S21 to S22.

[0063] S21, laying the improver on the base bed 4, and crushing and stirring the surface layer of the base bed 4 to mix the improver with the surface layer of the base bed 4.

[0064] S22, compacting the surface layer of the base bed 4 mixed with the improver to form a solidified layer 3.

[0065] In this embodiment, after the improver is laid on the base bed 4, the surface of the base bed 4 is crushed and stirred by an excavator or other tools, so that the surface of the base bed 4 is loosened and then fully mixed with the improver, so that the water content of the surface of the base bed 4 reaches the standard value. After the surface of the base bed 4 with the water content reaching the standard value is compacted by a small manual compacting machine, the compacted surface of the original base bed 4 has a certain strength and rigidity, thereby forming a solidified layer 3 with a certain thickness.

[0066] The drainage slope of the roadbed surface shall be maintained as it is. If the original design data is missing, the drainage slope of the roadbed surface can be reasonably designed in combination with the topography and the layout of existing drainage facilities. The minimum slope should not be less than 2%.

[0067] Preferably, the compaction degree of the solidified layer 3 needs to reach ≥ 90%.

[0068] Preferably, the small manual compaction machine is a frog-type rammer or an impact rammer.

[0069] According to the present invention, the improver is mainly used to adjust the water content of the surface layer of the base bed 4 .

[0070] When the moisture content of the base bed 4 is higher than the standard value, the improver includes cement and quicklime. In the above step S21, cement and quicklime are laid on the base bed 4. Those skilled in the art can adjust the amount of cement and quicklime according to the base bed 4 under actual working conditions, so that the stiffness and strength of the finally formed solidified layer 3 meet the requirements.

[0071] When the water content of the base bed 4 is lower than the standard value, the improver includes cement and bio-enzyme curing material, and the bio-enzyme curing material is an aqueous solution improver, which can play a role in increasing the water content of the surface layer of the base bed 4. In the above step S21, cement and bio-enzyme curing material are laid on the base bed 4. Those skilled in the art can adjust the amount of cement and bio-enzyme curing material according to the base bed 4 under actual working conditions, so that the stiffness and strength of the finally formed solidified layer 3 meet the requirements.

[0072] In addition to increasing the water content of the surface layer of the base bed 4, the bio-enzyme solidification material can also catalyze the organic and inorganic substances in the surface layer of the base bed 4, and can reduce the hydraulic conductivity coefficient of the clay particles and reduce the thickness of the water film on the surface of the clay particles, so that the formed solidified layer 3 has a dense structure, self-repairing ability and good waterproof properties.

[0073] The waterproof layer 2 is combined with the solidifying layer 3, and the waterproof layer 2 is used to prevent rainwater from penetrating into the solidifying layer 3 and the base bed 4. The solidifying layer 3 and the waterproof layer 2 are used to prevent the relatively weak base bed 4 at the bottom from bubbling up to the ballast bed 1, which can achieve a good treatment effect on the mud bubbling disease of the ballasted track subgrade. In addition, the solidifying layer 3 is formed by the original soil in-situ construction method, which avoids a lot of loading and unloading work, and greatly reduces the labor intensity and construction cost of the staff.

[0074] In a specific embodiment, in step S21, when conventional biological enzymes and cement are selected as modifiers, cement should be spread on the base bed 4 first, and after the initial mixing, the biological enzyme should be sprayed and mixed for the second time. The specific mix ratio of cement and biological enzyme can be determined by indoor tests. When cement and quicklime are selected as modifiers, they can be spread at the same time.

[0075] In some specific embodiments of the present invention, in step S21, when Lewis enzyme and / or Lewis royal jelly are selected as the bio-enzyme curing material, after adding the bio-enzyme composite curing agent to the surface layer of the base bed 4, the surface layer of the base bed 4 is stirred once.

[0076] In a specific embodiment, in step S3, as Figure 1 As shown, the waterproof layer 2 is laid on the upper surface of the solidified layer 3.

[0077] Furthermore, in this embodiment, the waterproof layer 2 includes a geomembrane 21 and a surface medium coarse sand layer 22 and a bottom medium coarse sand layer 23 arranged on the upper and lower sides of the geomembrane 21. In S3, the bottom medium coarse sand layer 23, the geomembrane 21 and the surface medium coarse sand layer 22 are laid upward in sequence from the top surface of the self-solidifying layer 3 to form a waterproof layer 2. When laying the bottom medium coarse sand layer 23, the thickness depends on the excavation depth, and the width of the bottom medium coarse sand layer 23 should be greater than the width of the geomembrane 21 by 20cm. Lay high-performance HDPE geomembrane 21 with a laying width of ≥4m. When laying, ensure that the geomembrane 21 is straightened and smooth, close to the bottom medium coarse sand layer 23, the center line of the geomembrane 21 is consistent with the center line of the line, the deviation shall not be greater than 5cm, and the overlap length shall not be less than 30cm. A climbing welding machine is used for welding. When laying the coarse sand layer 22 in the surface layer, the thickness is determined by the excavation depth, and the width of the coarse sand layer 22 in the surface layer should be greater than the width of the geomembrane 21 by 20 cm.

[0078] In a specific embodiment, in step S4, the excavated ballast is screened, and then qualified ballast is selected to re-pave the roadbed 1. Figure 1 As shown, the ballast bed 1 is laid on the upper surface of the waterproof layer 2, and then the sleepers 5 are arranged above the ballast bed 1.

[0079] In some embodiments of the present invention, step S5 is further included, and the content of step S5 is to perform line fine adjustment.

[0080] In some embodiments of the present invention, before step S1, a preparatory step is further provided, the preparatory step includes sub-step i, the content of sub-step i is: testing the optimal moisture content and the maximum dry density of the solidified layer 3 to be set, calculating the amount of water replenishment or water absorption to improve the surface layer of the original base bed 4 to the solidified layer 3 with the optimal moisture content, so as to determine the amount of bio-enzyme solidification material or quicklime.

[0081] Furthermore, in some embodiments of the present invention, the preparatory step includes sub-step ii, and the content of sub-step ii is: marking the position of the sleeper 5, performing elevation and centerline measurements, unloading and bagging the sand, and arranging cooling and locking according to the rail temperature.

[0082] It is easy to understand that there is no strict order between sub-step i and sub-step ii, and those skilled in the art can reasonably arrange the construction sequence of sub-step i and sub-step ii according to actual working conditions.

[0083] The ballasted track subgrade mud and blister treatment structure 100 using bio-enzyme solidification material to form the solidification layer 3 was tested. From the three aspects of material performance test, structural performance test and actual use verification, it can be shown that the solidification layer 3 formed by the bio-enzyme solidification material can effectively improve the subgrade stiffness and better inhibit the mud and blister disease. The test data are as follows.

[0084] Compressive strength test of the cured layer 3 formed by the bio-enzyme curing material:

[0085] Improved tests were conducted on low liquid limit clay (equivalent to the surface layer of the base bed 4), using 5 ratios of 0.04, 0.05, 0.06, 0.07, and 0.08 mL / kg of bioenzyme and 3% cement for the solidification layer 3. Static compaction method was used to prepare the specimens of the solidification layer 3, with a specimen size of Φ100 mm × 100 mm. After the specimen compaction degree was 95% and the curing time was 7 days and 28 days, the unconfined compressive strength test of the specimen was tested. The experimental results are shown in Table 1.

[0086] Table 1 Test results of unconfined compressive strength of specimens

[0087]

[0088]

[0089] According to Table 1, the specimens mixed with 0.06 mL / kg bio-enzyme curing agent and 3% cement can meet the requirement of 7d unconfined compressive strength of 2.5 MPa.

[0090] Improved soil structure real vehicle verification test:

[0091] Two roadbed structure conditions were selected for the test. The track structure of the two conditions was the same, and the roadbed thickness was 35cm. The difference lay in the subgrade structure.

[0092] Working condition 1: The surface layer of the base bed 4 is 0.7m graded gravel, and the bottom is filled with group C powder clay.

[0093] Working condition 2: The surface layer of the subgrade 4 is 0.3m graded crushed stone + 0.3m improved soil, and the bottom is filled with C group powder clay. The original improved soil is low liquid limit powder clay with a 17mm liquid limit of 27.3%, a 2mm plastic limit of 12.2%, and a plasticity index of 15.1. The content of P·O42.5 ordinary Portland cement added is 11% of the filler mass, and the content of the new composite modifier developed by China Academy of Railway Sciences Group Co., Ltd. is 3% of the cement mass. The 7d unconfined compressive strength of the sample with a height of 10cm and a diameter of 5cm is 2.2-2.5MPa.

[0094] For the above working conditions 1 and 2, three types of trucks, C70, C80 and C96, were used for actual vehicle verification, and the dynamic deformation of the roadbed surface was collected when the trucks passed. The axle weight of C70 is 23 tons, the axle weight of C80 is 25 tons, and the axle weight of C96 is adjusted to 27 tons, 30 tons, 32.5 tons, 35 tons and 40 tons, with a maximum speed of 80 km / h. The test results are as follows Figure 4 shown.

[0095] The dynamic deformation of the roadbed surface under the action of a real vehicle can effectively reflect the overall stiffness of the roadbed. The smaller the dynamic deformation, the greater the overall stiffness of the roadbed. Compared with a single layer of 0.7m graded crushed stone surface, 0.3m graded crushed stone + 0.3m improved soil surface has better overall stiffness, and the dynamic deformation is relatively reduced by 32-34%.

[0096] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0097] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0098] Finally, it should be noted that the above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A construction method for treating mud and slurry on ballasted track subgrade, characterized in that: The following steps are involved: S1, dismantle the structures above the foundation bed and dig down to the foundation bed; S2, improving the surface layer of the subgrade in situ, so that the original surface layer of the subgrade becomes a solidified layer with a certain thickness, thereby improving the water stability and rigidity of the surface layer of the subgrade; S3, laying a waterproof layer on the solidified layer; S4, restore the structure.

2. The construction method for treating mud bubbling on ballasted track subgrade according to claim 1 is characterized in that: In S2, the method for improving the surface layer of the base bed comprises the following steps: S21, laying an improver on the base bed, and crushing and stirring the surface layer of the base bed in situ to mix the improver with the surface layer of the base bed; S22, compacting the surface layer of the base bed mixed with the improver to form a solidified layer with a certain thickness.

3. The construction method for treating mud bubbling on ballasted track subgrade according to claim 2, characterized in that: The improver is used to adjust the water content of the base bed so that the surface layer of the base bed after crushing and stirring is easy to compact.

4. The construction method for treating mud bubbling on ballasted track subgrade according to claim 3 is characterized in that: When the moisture content of the base bed is higher than a standard value, the improver includes cement and quicklime.

5. The construction method for treating mud bubbling on ballasted track subgrade according to claim 3 is characterized in that: When the water content of the base bed is lower than a standard value, the improver includes cement and bio-enzyme solidification material.

6. The construction method for treating mud bubbling on ballasted track subgrade according to claim 1, characterized in that: In S3, a bottom medium-coarse sand layer, a geomembrane and a surface medium-coarse sand layer are laid in sequence upward from the top surface of the solidified layer to form a water-proof layer.

7. A ballasted track subgrade mud treatment structure constructed using the ballasted track subgrade mud treatment construction method according to any one of claims 1 to 6, characterized in that: It comprises a solidification layer (3) and a water-proof layer (2) which are sequentially arranged upward from the top of a base bed (4).

8. The structure for treating mud and slurry on ballasted track subgrade according to claim 7, characterized in that: The solidified layer (3) is formed by improving the surface layer of the base bed (4).

9. The structure for treating mud and slurry on ballasted track subgrade according to claim 7, characterized in that: The waterproof layer (2) comprises a geomembrane (21), and the geomembrane (21) is a HDPE geomembrane.

10. The structure for treating mud and sludge on ballasted track subgrade according to claim 9, characterized in that: The waterproof layer (2) comprises a surface medium-coarse sand layer (22) and a bottom medium-coarse sand layer (23) respectively arranged on the upper and lower sides of the geomembrane (21).

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